30.82% is the change from 623 to 815
Calculation steps:
[( 815 - 623 ) ÷ 623] x 100 = 30.82%
Formula
Percentage change = [(815 - 623) / 623] x 100
Subtract the new number by the original number
815 - 623 = 192
192 ÷ 623 = 0.30818619582664525
0.30818619582664525 x 100 = 30.82%